Ok I will be the first to answer.
Streetdeck is worth the money. The first time that you start having real problems and you have a phone number that you can call and talk to someone will make you fell better. Also the SD team is always looking at ways to make the product better. Yes there are other frontends that are free and some are very good. But I do not believe any of them have the total overall completeness of SD. With the way the Technology changes, SD will always look like it is in Beta to some(Because SD is always tring to give us the stuff we want).
You can not use you version of Microsoft Maps with SD. SD uses the Maps differently. Someone else could explain that better.
Overall I can say for me I have been very happy with Streetdeck and pleased with my purchase.
Just my 2 cents.